Method of and apparatus for spraying liquids



Jan. 192

11 7 A. HEROLD METHOD OF AND APPARATUS FOR SPRAYING mourns Filed Dec. 8,1925 INVENTOR Patented Jan. 11, 1927.

UNITED STATES ARTHUR HEROLD, OF PITTSBURGH, PENNSYLVANIA.

METHOD OF AND APPARATUS FOR SPBAYING LIQUIDS. v

A'pplioation filed December 8, 1925. Serial No. 74,137..

My invention relates to air and liquid spraying devices and particularlyto those which are employed in connection with the washing of motorvehicles. However, my invention is not limited to such use, but may beutilized wherever a spray having the peculiar characteristics producedby my device is desired.

One object of my invention is to provide apparatus for forming a spraythat 15 particularlv effective in connection with the removin ofreaseand dirt which adheres to 21 2* various partsof automobiles.

Another object of my invention is tov provide an arrangement wherebysubstantially uniform results may be secured under varying conditions ofwater supply. l

Still another object of my invention is to provide a spraying devicewherein a relatively small amount of air is required.

One form which my invention may take is shown in the accompanyingdrawing, wherein Fig. 1 is a view, partially in longitudinal section, ofapparatus embodying my invention, and Fig. 2 is a view of one of the airnozzles which I may employ.

A The apparatus comprises .a ,water supply conduit 3 that may beconnected to the ordinary city water supply, but when clean ng thoseportions of motor vehicles to which grease adheres, the water isreferably heated before entering the con uit 3. An air supply conduit 4is also provided, such supply being controlled in any suitable manner,as by a valve 5. The conduits 3 and 4 communicate at their forward endswith a nozzle head 6 with which a spray nozzle 7 has screw threadedengagement. An air nozzle 8 has screw threaded engagement with thenozzle head 6, at a point to the rear of the nozzle 7. The forward endofthe nozzle 8 is tapered somewhat for a considerable distance, on linesthat are parallelto adjacent faces of the nozzle 7. thus providing anannular space 9 that is of substantially uni form cross sectional area.This space is of substantially inch in width (the distance between theouter wall of the air nozzle and the inner wall of the main nozzle 7)and the various sizes of nozzles hereinafter referred to will be of suchoutside diameter as to preserve said width.

Since the apparatus is usually employed around garages wheresubstantially standard-air pressures are available, at pressures from 45lbs. per square inch and upward, I

;make provision for altering the nozzle arrangement in accordance withvariations in water supply. City water pressures are commonly foundranging from 20 lbs. pressure per square inch to 65 lbs. per square inchand upward.

I have found, in connection with air pres sures of 45 lbs. per squareinch and upward that by varying the size of the orifice of the airnozzle 8 and the distance of such orifice from the orifice of the waternozzle 7, in accordance withth water pressure, a desired quality ofspray is secured. It is important that the air be introduced into thestream of water at the proper distance from the main orifice, and thatthe airorifice be of approximately certain diameters under designatedwater supply conditions. If the air supply is at too far a distancerearwardly of the main nozzle, the water will be impelled forwardly inbulk without being sufiiciently broken up and will not have the desiredcutting effect on the surface to be cleaned. On the other hand, if theair nozzle is located too far forward in the nozzle 7 the flow of waterwill be retarded. Also, the diameter of the air nozzle must be such asto secure the desired proportions of airand water.

In the drawing I have shown the main nozzle 7 as having its orificeapproximately in diameter and the orifice of the nozzle 8 as located 1to the rear of the orifice of the nozzle 7. This arrangement has beenfound to give satisfactory results with pressures of 45 lbs. to 65 lbs.per square inch, and produces a spray which, at a distance of about 6"from the nozzle, has a diameter of approximately 6". Upon holding thehand in front of this s ray, the water will be found to have been rokenup into particles that produce a sensation similar to that produced bythe grains of sand in a sand blast.

When the spraying device is intended to be used with water pressures offrom 20 lbs. to 40 lbs. per square inch, an air nozzle of another sizeis substituted for the nozzle 8. The substituted nozzle will preferablyhave an orifice diameter of and be disposed 7 rearwardly of the orificeof the nozzle7. If a water pressure of 65 lbs.

or more per square inch is used, an air nozzlehaving an orifice 5% indiameter is employed and disposed 1% rearwardly of the main orifice. Ineach instance, a spray of about 6" in diameter is produced at a distance6" in front of the nozzle 7.

For other water pressures than those named above, air nozzles of stilldifferent sizes may be employed. Likewise, the air nozzles can bechanged to conform to various air pressure conditions.

While ordinaril the cleaning action of the spra is such that it willreadily remove grease i the water is slightly heated, without injury topaint, the device may also be employed for removing paint it steam orboiling water is substituted for water of relatively low temperatures.

I claim as my invention:

1. Spraying apparatus designed for use Withair pressure of 45 lbs. andupwards per square inch and with water pressures of 65 lbs. and upwardsper square inch, comprising a main nozzle provided with means forconnection to a source of liquid pressure, and an air nozzle disposedwithin the main nozzle and adapted for connection to a source of airpressure, the air nozzle orifice having a diameter of substantiallydisposed mined diameter and under a predetermined" pressure exceeding 20lbs. and under predetermined velocity, discharging centrally into raidstream a blast of air under pressure of at least 45 lbs. per square inchand of crosssectional area determined by said water pressure andvelocity, and discharging said mingled fluids in a stream ofpredetermined cross-sectional area and at a point, removed from thepoint of junction of the two fluids,

vwhich is dependent on said water pressure and velocity.

In testimony whereof I, the said ARTHUR Hnuonn, have hereunto set myhand.

ARTHUR HEROLD.

